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(ns viz.dial
(:require [quil.core :as q]))
(defn new-dial []
{:val 0
:min -1
:max 1
})
(defn- scale [v old-min old-max new-min new-max]
(+ new-min (* (- new-max new-min)
(/ (- v old-min) (- old-max old-min)))))
(defn scaled [dial min max]
(let [new-val (scale (:val dial) (:min dial) (:max dial) min max)]
(assoc dial :min min :max max :val new-val)))
(defn floored [dial at]
(if (< (:val dial) at)
(assoc dial :val at)
dial))
(defn invert [dial]
(assoc dial :val (* -1 (:val dial))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; plot is a sequence of [t val], where t is a normalized time value between 0
; and 1, and val is the value the plot should become at that point.
(defn new-plot [frame-rate period-seconds plot]
{:frame-rate frame-rate
:period period-seconds
:plot plot})
(defn by-plot [dial plot curr-frame]
(let [dial-t (/ (mod (/ curr-frame (:frame-rate plot)) (:period plot)) (:period plot))
]
(assoc dial :val
(reduce
(fn [curr-v [t v]] (if (<= t dial-t) v (reduced curr-v)))
0 (:plot plot)))
))
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